Fix: Accept empty token for `update_settings`
Just the same as in get_settings
here :
https://gitlab.labs.nic.cz/turris/foris-controller/foris-controller-sentinel-module/blob/master/foris_controller_modules/sentinel/schema/sentinel.json#L36
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Just the same as in get_settings
here :
https://gitlab.labs.nic.cz/turris/foris-controller/foris-controller-sentinel-module/blob/master/foris_controller_modules/sentinel/schema/sentinel.json#L36